Optics: measuring and testing – Velocity or velocity/height measuring – With light detector
Patent
1988-06-17
1990-03-27
Tarcza, Thomas H.
Optics: measuring and testing
Velocity or velocity/height measuring
With light detector
7386106, 364604, 36472803, 36472806, G01P 336, G01P 522
Patent
active
049125192
ABSTRACT:
There is provided a laser speckle velocity-measuring apparatus comprising: a semiconductor laser to irradiate the light to a moving object; first and second photo sensing devices whose light receiving points are arranged in the moving direction of the objects at a predetermined distance so as to be away from each other; a clock signal generating and control circuit for determining a clock frequency of the clock signal so that the number of clocks of the clock signal is always set to a constant value when the delay time of the photo sensing signal of the second photo sensing device for the photo sensing signal of the first photo sensing device is measured by the clock signals; and an arithmetic operating circuit for counting the clock signals and calculating the length, moving distance, or velocity of the object on the basis of the count value. With this apparatus, the detecting time of the length or velocity of the moving object can be reduced and the measuring processes can be performed in a real-time manner.
REFERENCES:
patent: 3947672 (1976-03-01), Harrison et al.
patent: 4201467 (1980-05-01), Hartmann et al.
patent: 4329047 (1982-05-01), Kikuchi et al.
patent: 4494213 (1985-01-01), Thompson
patent: 4580894 (1986-04-01), Wojcik
patent: 4779215 (1988-10-01), Moisan et al.
Kitajima Hiroshi
Nakatsuka Nobuo
Yamashita Tsukasa
Yoshida Tomio
Omron Tateisi Electronics Co.
Tarcza Thomas H.
Wallace Linda J.
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